Patents by Inventor Dean W. Kratzer

Dean W. Kratzer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20180001270
    Abstract: Metallopolyimide precursor fibers for aging-resistant carbon molecular sieve hollow fiber membranes having enhanced selectivity include transition metal cations complexed with electronegative regions of a polyimide. CMS membranes are made by pyrolyzing the metallopolyimide precursor fibers. The cations are introduced by including, in the bore fluid used to extrude the fibers, either a salt of the transition metal and an inorganic anion or a transition metal/organic ligand complex.
    Type: Application
    Filed: June 30, 2016
    Publication date: January 4, 2018
    Applicant: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Raja SWAIDAN, David J. HASSE, Madhava R. KOSURI, Canghai MA, Robert A. GAGLIANO, Henri CHEVREL, Dean W. KRATZER
  • Patent number: 9795927
    Abstract: A carbon molecular sieve (CMS) membrane is made by pyrolyzing a polymeric precursor membrane in a pyrolysis atmosphere containing a sulfur-containing compound.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: October 24, 2017
    Assignee: L'Air Liquide Société Anonyme Pour L'Étude Et L'Exploitation Des Procedes Georges
    Inventors: Henri Chevrel, Benjamin J. Jurcik, Jr., Philippe A. Coignet, Raja Swaidan, Dean W. Kratzer
  • Publication number: 20170189859
    Abstract: A zeolite enhanced carbon molecular sieve (CMS) membrane is made by forming a precursor membrane from a matrix of polymer and zeolite particles and pyrolyzing the precursor membrane.
    Type: Application
    Filed: December 31, 2015
    Publication date: July 6, 2017
    Inventors: Yudong CHEN, Madhava KOSURI, Edgar S. SANDERS, Dean W. KRATZER
  • Publication number: 20160184775
    Abstract: A carbon molecular sieve (CMS) membrane is made by pyrolyzing a polymeric precursor membrane in a pyrolysis atmosphere containing a sulfur-containing compound.
    Type: Application
    Filed: December 17, 2015
    Publication date: June 30, 2016
    Applicant: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Henri CHEVREL, Benjamin J. JURCIK, JR., Philippe A. COIGNET, Raja SWAIDAN, Dean W. KRATZER
  • Publication number: 20160184770
    Abstract: H2S is removed from a feed gas by a gas separation membrane including a separation layer that is made of a blend of P84 and Matrimid.
    Type: Application
    Filed: September 30, 2015
    Publication date: June 30, 2016
    Applicant: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Sudhir S. KULKARNI, Dean W. KRATZER, Edgar S. SANDERS, JR., Gregory K. FLEMING
  • Publication number: 20160184771
    Abstract: H2S is removed from a feed gas by a gas separation membrane including a separation layer that is made of a blend of P84 and Matrimid.
    Type: Application
    Filed: December 18, 2015
    Publication date: June 30, 2016
    Applicant: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Sudhir S. KULKARNI, Dean W. Kratzer, Edgar S. Sanders, JR., Gregory K. Fleming, Fan Z. Worley
  • Publication number: 20160151746
    Abstract: A carbon molecular sieve (CMS) membrane is made by pyrolyzing, to a peak pyrolysis temperature TP, a hollow fiber membrane having a polymeric sheath surrounding a polymeric core, anti-substructure collapse particles present in pores formed in the polymeric core help prevent collapse of pores formed in the hollow fiber membrane before pyrolysis. The anti-substructure collapse particles are made of a material or materials that either: i) have a glass transition temperature TG higher than TP, ii) have a melting point higher than TP, or ii) are completely thermally decomposed during said pyrolysis step at a temperature less than TP. The anti-substructure collapse particles are not soluble in a solvent used for dissolution of the polymeric material of the core.
    Type: Application
    Filed: August 14, 2015
    Publication date: June 2, 2016
    Inventors: Dean W. KRATZER, Madhava R. KOSURI, Canghai MA
  • Patent number: 8747525
    Abstract: A composite hollow ceramic fiber includes a porous hollow core supporting a thin, dense sheath. The non-gas-tight core comprises a first ceramic compound and an interconnecting network of pores. The gas-tight sheath comprises a second ceramic compound. The fiber is made by extruding first and second suspensions of the first and second ceramic compounds in polymeric binders and solvent from a spinnerette and coagulating the nascent hollow fiber to effect phase inversion of the polymeric binders. The resultant green fiber is sintered in a two step process. First, the binder is burned off. Second, the sheath is densified and the second ceramic compound is sinter without fully sintering the first ceramic compound. The first ceramic compound has a melting point higher than that of the second ceramic compound.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: June 10, 2014
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Dean W. Kratzer, Tao Li, Madhava R. Kosuri
  • Patent number: 8741031
    Abstract: A composite hollow ceramic fiber includes a porous hollow core supporting a thin, dense sheath. The non-gas-tight core comprises a first ceramic material and an interconnecting network of pores. The gas-tight sheath comprises a second ceramic material. The fiber is made by extruding core and sheath suspensions from a spinnerette. The core suspension includes particles of the first ceramic material, a polymeric binder, a solvent, and a pore former material insoluble in the solvent. The sheath suspension includes particles of the second ceramic material, a polymeric binder and a solvent. The nascent hollow fiber is coagulated in a coagulant bath to effect phase inversion of the polymeric binders. The resultant green fiber is sintered in a two step process. First, the binders and pore former material are burned off. Second, the sheath is densified and the second ceramic material is sintered without fully sintering the core.
    Type: Grant
    Filed: July 31, 2011
    Date of Patent: June 3, 2014
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Madhava R. Kosuri, Dean W. Kratzer
  • Publication number: 20130025459
    Abstract: A composite hollow ceramic fiber includes a porous hollow core supporting a thin, dense sheath. The non-gas-tight core comprises a first ceramic material and an interconnecting network of pores. The gas-tight sheath comprises a second ceramic material. The fiber is made by extruding core and sheath suspensions from a spinnerette. The core suspension includes particles of the first ceramic material, a polymeric binder, a solvent, and a pore former material insoluble in the solvent. The sheath suspension includes particles of the second ceramic material, a polymeric binder and a solvent. The nascent hollow fiber is coagulated in a coagulant bath to effect phase inversion of the polymeric binders. The resultant green fiber is sintered in a two step process. First, the binders and pore former material are burned off. Second, the sheath is densified and the second ceramic material is sintered without fully sintering the core.
    Type: Application
    Filed: July 31, 2011
    Publication date: January 31, 2013
    Inventors: Madhava R. KOSURI, Dean W. KRATZER
  • Publication number: 20130000488
    Abstract: A composite hollow ceramic fiber includes a porous hollow core supporting a thin, dense sheath. The non-gas-tight core comprises a first ceramic compound and an interconnecting network of pores. The gas-tight sheath comprises a second ceramic compound. The fiber is made by extruding first and second suspensions of the first and second ceramic compounds in polymeric binders and solvent from a spinnerette and coagulating the nascent hollow fiber to effect phase inversion of the polymeric binders. The resultant green fiber is sintered in a two step process. First, the binder is burned off. Second, the sheath is densified and the second ceramic compound is sinter without fully sintering the first ceramic compound. The first ceramic compound has a melting point higher than that of the second ceramic compound.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 3, 2013
    Inventors: Dean W. KRATZER, Tao LI, Madhava R. KOSURI
  • Patent number: 7950529
    Abstract: A membrane for fluid separation made of a blend of at least a polyimide polymer and a polyimidazole polymer.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: May 31, 2011
    Assignee: L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Sudhir S. Kulkarni, Dean W. Kratzer
  • Publication number: 20100078386
    Abstract: A membrane for fluid separation made of a blend of at least a polyimide polymer and a polyimidazole polymer.
    Type: Application
    Filed: September 30, 2008
    Publication date: April 1, 2010
    Inventors: Sudhir S. Kulkarni, Dean W. Kratzer
  • Patent number: 7476636
    Abstract: Mixed matrix composite (MMC) membranes with minimal macrovoids and defects are provided by the current invention. MMC Membranes are needed that have minimal macrovoids and defects, provide consistent and good selectivity and permeability performance, provide the mechanical strength required to withstand high membrane differential pressures, and exhibit sufficient flexibility and can easily be formed into desirable membrane forms. MMC Membranes made from a spinning dope that is stabilized with an electrostabilizing additive, particularly an acid additive, results in membranes, particularly hollow fiber membranes that have minimal macrovoids and defects. Thus, membranes of the current invention are particularly suitable for high trans-membrane pressure applications, particularly for separating oxygen/nitrogen, hydrogen/hydrocarbon, and carbon dioxide/hydrocarbon components of a stream.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: January 13, 2009
    Assignee: L'Air Liquide, Societe Anonyme A Directoire et Conseil de Surveillance pour l'Etude et l'Exploration des Procedes Georges Claude
    Inventors: Sudhir S. Kulkarni, David J. Hasse, Dean W. Kratzer